Acopower PWM20A Product Introduction

The Acopower PWM20A is a 20A Pulse Width Modulation (PWM) solar charge controller designed for off-grid solar systems. It efficiently manages the charging of 12V/24V battery banks from solar panels, featuring advanced PWM technology, multiple protection functions, LCD display, user-configurable settings, and compatibility with various battery types. Below are key sections for features, installation, operation, specifications, and maintenance.

Features at a Glance

Key components: PWM20A controller unit, LCD display, terminal blocks for battery, solar panel, and load, mounting brackets, user manual.

Installation Guide

Unpack and verify contents. Choose a dry, well-ventilated location away from direct sunlight and heat sources.

1. Mount the controller: Use provided screws for wall mounting or attach to DIN rail.
2. Connect the battery: First connect battery terminals (BAT+ and BAT-) to ensure controller powers up.
3. Connect solar panels: Connect PV+ and PV- terminals from solar array.
4. Connect load: Attach DC load wires to LOAD+ and LOAD- terminals if used.
5. Power up: The LCD will illuminate showing battery voltage.

WARNING! Always connect battery first and solar panel second to avoid damage. Ensure all connections are tight and correct polarity is observed.

Initial Setup & Configuration

After installation, configure settings for your specific battery and system requirements.

1. Set battery type: Press MENU, navigate to battery type, select Sealed, Gel, Flooded, or Lithium.
2. Configure charging parameters: Set bulk/absorption voltage, float voltage, and equalization (if applicable).
3. Set load control: Configure timer for automatic load on/off (e.g., lighting).
4. Set low voltage disconnect (LVD): Protect battery from deep discharge.
5. Save settings: Press and hold SET for 3 seconds to save and exit.

CAUTION! Incorrect battery type settings may damage batteries. Refer to battery manufacturer specifications.

Technical Specifications

• Rated Current: 20A continuous.
• System Voltage: 12V/24V auto-detect or manual select.
• Max PV Input Voltage: 50V DC.
• Max PV Input Power: 260W (12V) / 520W (24V).
• Charging Algorithm: PWM with 4-stage charging (Bulk, Absorption, Float, Equalization).
• Display: Backlit LCD with real-time data.
• Communication: Optional RS485 (Modbus protocol).
• Operating Temperature: -20°C to 50°C (-4°F to 122°F).
• Dimensions: 158mm x 98mm x 45mm (6.2" x 3.9" x 1.8").
• Weight: 0.45 kg (1 lb).

Controls & Interface

Front panel includes LCD display, LED indicators, and three buttons (MENU, UP, DOWN/SET).

LCD Display: Shows battery voltage (V), charging current (A), battery state of charge (%), load status, and error messages.

LED Indicators: Green (charging), Yellow (battery full), Blue (load on), Red (fault).

Button Functions: MENU - access settings; UP/DOWN - navigate/change values; SET - confirm selection (press and hold to save).

Menu Structure: Battery Type, Charging Voltage, Float Voltage, Equalization, Load Control, LVD Setting, System Voltage, Temperature Compensation, Factory Reset.

System Connections

Terminal block connections (from left to right): BAT+, BAT-, PV+, PV-, LOAD+, LOAD-.

1. Use appropriate wire gauge: Minimum 10 AWG for battery and PV connections at 20A.
2. Install fuses: Recommended 25A fuse on battery positive line close to battery.
3. Grounding: Connect controller chassis ground to system ground if required.
4. Communication: Connect RS485 adapter to COM port if using monitoring.

Tip: Use copper conductors only. Keep wire runs as short as possible to minimize voltage drop.

Operating Modes

The controller operates in several automatic modes based on battery condition and solar input.

1. Charging Modes: Bulk (constant current), Absorption (constant voltage), Float (maintenance).
2. Equalization: Periodic overcharge for flooded batteries (user configurable).
3. Load Control: Manual on/off or timer-based (1-15 hours).
4. Night Mode: Load automatically turns off at sunset (with light sensor option).
5. Low Power Mode: Controller reduces own consumption when battery is low.

Note: Equalization is only for flooded batteries. Do not use with sealed or lithium batteries.

Protection Features

Multiple protections ensure safe operation and prevent damage to components.

Maintenance & Care

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check all connections for tightness and corrosion.
2. Quarterly: Clean controller exterior with dry cloth; ensure ventilation openings are clear.
3. Annually: Verify settings match battery requirements; check for firmware updates.
4. Battery Maintenance: Monitor battery voltage and state of charge regularly.

CAUTION! Disconnect solar panels and battery before cleaning. Do not use water or cleaning solvents.

Compliance & Warranty

CE certified: Complies with European safety standards. RoHS compliant: Free of hazardous substances. FCC Part 15: Class B digital device. Warranty: 2-year limited warranty from date of purchase. For technical support, visit www.acopower.com or contact [email protected]. For warranty claims, retain proof of purchase.

Troubleshooting Guide

Reset Procedure: Disconnect PV and battery for 1 minute, then reconnect battery first.

Support: Email [email protected]; Phone: 1-800-123-4567; Website: www.acopower.com